Question: Who is the {human} for {position held} of {United Nations Secretary-General}
Paraphrase: Who is the {human} for {position held} of {Joined together Countries Secretary-General}
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P39 wd:Q81066 . ?sbj wdt:P31 wd:Q5 } 
Answer: António Guterres, Kofi Annan, Ban Ki-moon, Javier Pérez de Cuéllar, Boutros Boutros-Ghali, Kurt Waldheim, Dag Hammarskjöld, U Thant, Trygve Lie, Gladwyn Jebb